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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<style type="text/css">
* {
padding: 0px;
margin: 0px;
border: 0px;
outline: none;
}
body {
width: 100%;
height: 100%;
}
.main {
background: black;
display: flex;
flex-wrap: wrap;
flex-direction: row;
justify-content: space-between;
align-items: stretch;
align-content: space-between;
}
.main>div {
height: 100px;
}
/*1*/
.main1>.red {
background: red;
width: 33.333%;
display: flex;
align-items: center;
justify-content: center;
position: relative;
}
.main1>.red .green {
width: 60px;
height: 60px;
background: green;
}
.main1>.red .blue {
width: 40px;
height: 40px;
background: blue;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
.main1>.green {
background: green;
width: 33.333%;
}
.main1>.blue {
background: blue;
width: 33.333%;
display: flex;
align-items: center;
justify-content: center;
position: relative;
}
.main1>.blue .green {
width: 60px;
height: 60px;
background: green;
}
.main1>.blue .black {
width: 40px;
height: 40px;
background: black;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
.sb {
animation: sbs 3s linear infinite;
}
@keyframes sbs {
0% {
transform: rotate(0deg);
}
100% {
transform: rotate(720deg);
}
}
</style>
</head>
<body>
<div class="main main1">
<div class="red">
<div class="green sb"></div>
<div class="blue"></div>
</div>
<div class="green"></div>
<div class="blue">
<div class="green sb"></div>
<div class="black"></div>
</div>
</div>
</body>
</html>
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原文地址：http://www.cnblogs.com/libin-1/p/5954705.html
